Nortec Modbus - Manual (Page 13)

Addressing and Communications
Once the humidifier has been wired to the network, control variables must be mapped to allow
for control of the humidifier. The specific variables and communications requirements for each
humidifier are described in the following sections.
NH-EL Electrode Steam Humidifiers
After wiring connections have been completed, the humidifier needs to be setup to operate and
communicate either through the Modbus or BACnet interface.
Modbus Communication Set-up
The default Modbus address for an NH-EL is 10. If multiple units were included on an order, the
addresses of individual units may vary. To view or change the Modbus address:
1 Press the Menu icon on the lower left corner of the screen, to access the menu.
2 When prompted for a password, enter 0335 using the number pad. Press the Check Mark
icon to confirm.
3 Select the Configuration menu.
4 Select the Comms. menu.
5 Using the navigation buttons on the top right of the screen, scroll down to the Modbus
Parameters.
Note: By default, Modbus is disabled. To enable Modbus, select
Modbus under Modbus
Parameters . Select ON and confirm the selection by pressing the Check Mark button.
6 Select the Modbus Address setting. Using the Up and Down arrows, select a value between
1 and 247 inclusive as desired and press the Check Mark button to confirm the selection. It
is recommended to leave the parity and baud rate settings to their factory defaults (Even
and 9600 respectively) unless communication problems occur.
7 Press Back repeatedly until you return to the home screen.
This procedure is summarized below:
Main Menu > 0335 > Configuration > Comms. Menu > Modbus Parameters >
Addr: 10 (1 – 247 acceptable)
Parity: Even (None, Even, Odd)
Baud Rate: 9600 (9600, 19200, 38400, 115200)
10 |Modbus Installation